Machine-leveling means



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- 1.592.949 E. H. LICHTENBERG s nomma Lsvsmuo :sus

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K v., l L v l A W l Eva ` v lvwento'f l attoznuts latented July 20, 1926.

UNITED STAT-ES i inane PATENT- espiga ERICH H. LCI-ITENBERG, OF MILWAUKEE, WSCONSIN, ASSIGNOR T0 KOEHR'NG COM- PANY, OF MILVA'U'KEE, WISCONSIN, A CORPORATION.

MACHINE-LEVELNG lfIEANS.

Application filed August 4, 1923.

Large concrete pavers, of the class shovvn in my United States Letters Patent No. Lili-La7() of June l, 1915embody a miXer for concrete, a boom and bucket mechanism to distribute the concrete in the form of an attachment extending from the rear end ofV the machine, and usually a loading skip and batch boi; handling derrick or crane at the front end of the machine. These inachines are being used today to much advantage in all road construction including roads in hilly and mountainous country Where the grade inclination is very considerable'. rl`he foregoing represents one problem encountered in the operation of these machines making necessary adjusting means to mainn tain the boom and bucket distributer horizontal for its efficient operation.

-Another problem of use of concrete pavers of the class referred to is involved in constructing roads banked or upraised at the outside of curved sections, known as superelevated curves. This method of banking the road pavement is coming into use more and more, and, necessarily the paving machine that handles the concrete must travel on a banked sub-grade Which tilts the machine and its supported attachments to one side unless some means is utilized to prevent such action. Here, again, is a condition under which the boom and bucket attachment and batch box crane cannot operate 'with highest efficiency as the machine is usually constructed, and, furthermore, in certain types of machine other features of the mechanism such as the skip, and batchbox .loading crane are similarly affected.

My invention contemplates, therefore, a design of concrete paver with adjusting means by which the base or chassis of the ma chine in be properly adjusted to enable the boom and bucket distributer to operate in horizontal or substantially horizontal positions at any point in itscustomary range of swinging movement, and whereby the machine may be generally leveled. Y

liiy invention contemplates the provision of a concrete paver with means to adjust the same to accommodate for a proper functioning of the boom and bucket, or crane and skip, or all of such means When the machine is Working up or down grade, endivise speaking, and on super-elevated curves which are provided to bank the pavement Serial No. 655,645,

properly in,u either direction side-Wise or across the road subegrade.

My invention makes provision for leveling means by the use of special adjusting devices intermediate the chassis or frame of the machine to Which the invention is applied and the supporting Wheels or axle. The said adjusting devices are susceptible of independent adjustn'ient to enable one side of the machine to be elevated or lowered relatively to the other, or the adjusting devices may be operated to effect a correspondence of adjustment thereof, relatively speaking, this being desirable when the machine is on a level roadgrade. Again, the adjusting devices are adjustable so that either end of the machine may be elevated or lowered relatively to the other,

Not only is the leveling of the machine for insuring proper 4operation of the distributing device (either a boom and bucket, or chute attachment) highly desirable, but it is likewise very important to obtain proper action of the crane or derrick means that handles the batch boxes, Vand is supported on the frame or body of the machine. Moreover, if the machine body is adjusted relative to its traction base there becomes necessary adjustment of the pivot connections be- -tiveen the skip and said body, so the skip will not hit the ground at an angle.

The provisions n ade, therefore, by the invention are such as will enable the correct operation vof the crane or derrick feature aforesaid, and enable the skip to be adjusted so it Will drop to the subgrade and rest iatly thereon even though the latter is not level. use of special adjustable connections between the skip and its pivot bracket connections with the frame of the machine.

Upon consideration of the foregoing it will be apparent that the invention provides means to level the Whole paving machine, practically speaking, to maintain stability and operativeness of the distributor and the batch boX loader, and means toviadjnst the skip as required by the adjustmentl of the body of the machine, especially Where a side- Wise slant or banking of the sub-grade makes necessary the saidrelative adjustment of the machine body and its traction base.

Figure l is aA diagrammatic side vieiv of a concrete paver shoivn as ascending a grade,

The latter proposition involves the as when laying pavement on the sub-grade or hilly or mountainous country;

Figure 2 is diagrammatically illustrative of the Way in which my leveling means is mounted between, say, the rear axle construction of the machine and thefchassis;

Figure 3 illustrates a front axle construction of a paver Where three point 'suspension is used and which eliminates the necessity for special leveling means betiveen the front endet the machine and frame or chassis;

Figures 4 and 5 are sectional"views von the lines 4 4 and 5 5, respectively, of Figure 9 and 'showing more clearly the parts therein illustrated;

Figure 6 is a detail vieu7 of the upper adjusting or cam member; n j

Figure 7 is a detail view ot the loiverot said adjusting members; j

Figure S is a front view of the trame ot a heavy machine mounted on Wheels or cndless traction members, and illustrating the preferredembodiment of; the invention;

y Figure 9 is an enlarged front view of one ot the bearing brackets shouting more clearly the `adjiisting members, the axle bearing members, `and the connection lbetween the lower adjusting member and the upper ot the` bearing members; and

Figure l0 is aside view of the parts shown in Figure). j

Figure 11 is an enlarged side view of the skip, broken` away, and the adjustable means connecting it to its pivot bracket.

j Figures 12 andl 13 are top and end vien-s lofthe saine.

Figure-14: is a front end view of the paver showingv one of the sidewise adjustments ot th'e sln'pyforits regular longitudinal tilting operation to elevate and discharge a load ot aggregates into the mixer. j

Referring in a Ageneral WayprtoFigures l to 8 inclusive, I might note that the teatures oft construction diagrammatically shown involve a paver which comprises the base trame or chassisA` on which' is mounted Ythewmixer B, the Vchassis being carried by multi-planes or endless traction devices LC, in lieu of which, however, Wheels might be employed 'as Jfound desirable. y On the front end of the machine is mountedV the loading ship D and atthis same end, but at one side of the machine, is carried the batch box loading derricl; or crane E having the boom F shown as supporting 4a batch boi; Gr. From the rear `en'd of the machine the boom H ot a boom and bucket distributing attachment projects in the usual vvay and carries the buck-et I which is moved back and forth by suitable means, this boom and bucket attachmentv being largely as set torthin my Letters Patentv'previously identiiied herein.

Machines of the type improved upon by my invention inaymhave theftrame or chassis A supported on front and rear axles by rigid means somewhat as shown diagrammatically in Figure 2 and also in Figure 8 Where one type of my adjusting mechanism is illustrated. On the other hand, in certain constructions et paver-s now f in use,

point suspension, involving a pivoting of the frame or chassis A to the middle ot' the front axle as shown at G. The axle itself is designated B and will 'not be described in detail as to its mounting because this will be obvious to any one versed in the art.

Vhere a paver is constructed With rigid connections between the axles and both ends oi Kthe traine or chassis fr, my adjusting or leveling devices to be hereinafter set iorth in detail may be employed at both ends of the traine or machine body intermediate its respective sY .es and the opposite ends 'ot the respective axles. lVhe're, however, I use a three point suspension for the front end ot the machine I contemplate that the leveling means which adjusts 'the rear end will ot course adjust the body et the machine upon the iront axle by a lateral pivotal movenient, so far as adjustments may be required tor leveling the machine parts in laying the pavement onsupcr-elevated curves, so-ca'lled. lWhere the leveling means in this particular construction is possessed ot a fairly Wide range ot anjustment, it may be suitably used to move the rear end of the machine up or down relatively to the liront end 'in obtaining a vleveling action tor the purpose heretofore referred to, in 'conjunction with operations on grades Where one end ot the machine has to be either higher or lower than the other. Y he controlling factor is Whether the grade is ascending er descending, of course.

It is therefore to be understood that my invention contemplates a use oi leveling means such as I shall particularly point out and dcscr'be in one construction, Ihereinafter, utilised between the ends of both front and rear axles where necessary, between both nds ot a rear axle ivhere the tront axle is mounted on the three point suspension principle, or between both ends or a rear axle nly, irrespective ot the mounting of the trent axle, when the adjusting n sans Will at- ;t'ord a suitable adjustment up and down for the rear end ot the machine in relation to the frontv end.

Secured in any substantial manner lto said `trame A -lor cooperation with a'n axle B are the supporting brackets l which might be characterized as ot somewhat skeleton const'ructioi'i in that they are slotted to some extent both between the sides and between the front and rear portions. Mounted in slots or open spaces between the sides of each bracket l are the adjusting instrumentalities comprising the upper adjusting member', cam or wedge 2 and the lower adjusting member, cam or wedge 3. The said members 2 and 3 have the adjacent surfaces thereof contacting and disposed at a wedging inclination. so that by moving these members longitudinally relative to one another the upper surface of the upper member 2 and the lower surface of the lower memr4 ber 3 will be separated cr brought closer together, with a resulting camming or' wedging action which is produced upon the parts engaging said particular surfaces, all in an obvious manner in view of the common knowledge of the action of wedging.

To prevent displacement of the adjusting members 2 and 3 from their particular bracket 1, I form outwardly projecting ribs 2a at theetop ofthe member 2 engaging above ribs el at the opposite sides of the slot or clearance space of the bracket 1 in which the members 2 and 3 are mounted. Projecting inwardly from the opposite sides of said clearance space of the bracket l are the inclined ribs 5 and the lower adjusting member 3 is providedwith spaced ribs 6 which in effect produce grooves 7 at opposite sides of said member, said groov-es'adapted to receive the ribs 5. The arrangement of the ribs 4 and 5, together with the pulling and pushing devices that cooperate with the members 2 and 3 to produce their camming `or wedging action, obviates liability of unauthorized displacement of the parts 2 and 3 from the bracket l.

The upper adjusting member 2 engages a bearing surface 8 of the bracket 1, the same being a horizontal web, practically speaking, and the lower side of the member 3 is formed with a curved bearing element 3a which is seated in an arcuate-shaped seat or recess 9 in the upper bearing member l() mounted in the bracket 1 to engage the upper side of the axle B. rlhe upper bearing member 10 is secured to a lower bearing member 11 by suitable bolts 12 or the like, and the axle B is received between said bearing members and preferably is a nonturning axle, though this is immaterial within the purview of the invention.

At the outer ends thereof the axle B has secured thereto wheels or endless tread devices which will be termed traction members 13 for the` purposes of this description. Sprockets or other driving means 14 may be connected with said traction members 13. The bearing members 10 and 11 are freely movable up and down in the bracket 1 through the provision of a suitable clearance space in the bracket, in which space said members may operate.

I now come to the means used by me for moving the members 2 and 3 relatively to one another. Said means is virtually a pulling and pushing device intended to pull the adjusting members 2 and 3 together, or in one direction, or in opposite directions, s0 to speak, to increase the distance between the upper surface of the member 2 and the lower surface of the member 3 and thereby move the engaged bearing member 10 and axle B` downwards. An opposite movement of the pulling and pushing member will produce an opposite result, in an obvious manner.

The pulling and pushing members are provided one for each bracket 1, or one for each set of the adjusting members 2 and 3. They are best shown in Figures 3, Ll and 5, and each comprises a screw 15 having a turning handle or crank 16 at one end and near that end passing through an opening in the larger Vend of the adjusting member 3. A swivel connection between said screw and said portion of the adjusting member 3 is produced by bosses 17 on the screw at opposite sides of the wall of the member 3 through which the screw passes. Said member 3 is slotted so that at its other end the screw 15 may operate in a sort of clearance space, and likewise the member 2 is similarly slotted for the same purpose.

As seen best in Figures 5 and 6, the screw portion of the screw 15 passes through the right hand end wall of the adjusting meniber, cam or wedge 2 at the point 2b and also passes through the outer end of a.loop 2C formed with said wall of the member 2. The loop 2c being spaced at its outer end v from the adjacent end of the wall 2 provides a small space for a nut 18 screwed on the screw 15 and providing an` abutment between the screw and the part 2.

Vith the foregoing explanation of construction, it will be evident that by the simple turning o f the screw 15 by the crank 1G the adjusting members, cams or wedges 2 and 3 may be pushed or pulled in opposite directions to thereby adjust the end. ofthe axle B with which a particular set of said members coacts. This adjustment, of course, may be by an up or down movement of the bearing members 10 and 11, and I utilize the curved contacting parts 3a and 9 between the members 3 and 10 in order to accommodate for a tilting of the axle B transversely to the member 3, necessarily resulting in a sort of arcuate movement of the axle, relatively speaking, with the cent-er of movement slightly below the curved bearing element 3a of the lower adjusting member 3. Figure 8 illustrates how one end of the axle is adjusted above the other end to accommodate for a leveling of the machine frame A, as when the surface on which the machine is traveling or stationary, is lower at one side than the other.

Of' course the adjustment of the body A of the machine relative tothe tractionv base C takes care or" the required adjustment of the crane attachment E, aswell asfthe distributor H-I, which lattervmight be of the spout or chutetype so far asthis feature of the niaclii1ie,and its advantages, are con* eerned. Itis Within the purvievi7 of'my inL vention, however, tovuse special adjusting means for the crane feature, and for the distributer, irrespective of use of those means setforth hereinA to adjust-'the body A rela'- tively to the base C. The adjustment of the crane feature to leveleit is highly important, furthermore, becausethe crane is operated every time a batch ofaggregates is to be' introduced into the miner (usually onceI a minute), Whereas the swing-ing" of the: distributor' horizontally is performed lessl frequently.

Referring.noivtoithe skip construct-ion of Figs: lli to 1131 inclusive, ity will be seeirthat the skip D is carried bythe'v bracket 2O directly pivoted tothe framework of the machine. Obviously an adjustment of the body A to accommodate for'banlredgrades, as-for instanceillustrated Yon Figs. 2, 3 and 14,' orI reverse inclinations of thersubgrade, correspondi gly'adjust's theflraine of thefniachine on said body. rIhis would cause the slip to remain with its bottoni leve-l! or hori- Zontal (laterally of the` subgrade) when the subgrade inclines for banking pur-poses, if not3 provided against. l avoid d-ii'iiculty in this connection by meansnovv to besetforth.

On the upper endi of the' ship is a sort of socket platefQl, equipped Witli-oifstanding sidelirgsla slotted downwardly atl Art outermost portions the platefllhas apertured lugslQS, the apertures of which coin'- cide with these of lugs 24 on the outermost partsof a 'casting-*25 rivetedto the sides of the bracket structure 20: Adjusting bolts 26 passthroughthe lugs Q3 andlzqflat opposite'sides of the shipv and its bracket caso ing, and by turning the nuts 2T properly", the-ship D- Will be given a rotative movementv Withintlie space betweentlie braclret sides andthusadjusted angularly until its bottom isparallel With the Alateral slant of the subgradef and thereby enabled to rest flat thereon, (see Fig. 14n-) Theadjustnient of'y the ship Drelatively to its bracket structure is preferably fixed by the locking bolts that enter the'slotsV 2'2 ofthe lugs 2l and pass through kthe sides of the bracket structure 20. ln lieu of the'ineans just'described he skipD may be left undisturbed at its pivotal mounting and a chock of tapering form adjustably applied to its bottom to thus lproperly support the skip when it is down on the subgrade.

lt is almost obvious, additionally, that if the machine is to be positioned for Work on a road or surface such that'ordinarily the' front end of tliemachine or the rear end ivouzfd be at ai different level from its opposite end', a leveling of the frame A nia-y be produced merely by adjusting the screws l5 so that theiadjusting members 2 and 3' of both sets for one axle B will be at substantiallyv the same relative positions and properly adjusted as regards the sets of said members at theopposite end of the machine,to cause an eleva'tionor lowering of the particular end of the machine requiring adjustment, as the-case may be.

lVhile' llhafve illustrated a preferred embodiment of t'heinvention as including specialA adjusting devices of' a'particular form, I do not Wish tobe'limited tliereto necessarily, for my invention comprehends the employment of other divers expedients inthe nature of similar. mechanical structures Vby which lilrerresults may be produced;

Having thus described my invention, what claim :as new and desire to secure' by Letters'Patent is l. InV a machine ofthe class described, in combination, a portable supporting frame, means to be supplied with materials mounted upon said frame, a loading device for supplyingsaid materials'to said previously mentioned means andv adapted to rest upon the ground, andania'djustable connect-ion between the supporting frame and said loading device` whereby the latter may rest in propereonta-ct W'itli the groundeventhough the portable supporting frame isinclined to the horizontal. i

2. In-amachine ofthe classdescribed, in combination, a Aportable supporting frame, a body structure mountedruponsaid frame, means intermediate the tivo whereby they may be relatively adjusted so that the body structure Willv remain horizontaleven if the supporting-'frame is disposed at an angle to the horizontaha loading device connected with. said body structure, adapted to rest upon the ground and movable into an elevated position to discharge its contents, and an adjustable connection between said loading device vand said body structure whereby the loading devicemavbe turned relatively to the body structure to enable the loading device to rest upon theground in proper supporte'drelation relative thereto. v

3. In a machine of the class described, in combination,'zi-portable supporting` frame, a body structure mounted upon said frame, meansintermediate the tivowhereby they may be relatively adjusted so'that the body structure will remain-'horizontal even ifthe supporting frame is disposedat anv angle to thehorizontal, a loadingv deviceconnected With said body structure, adapted to rest upon the ground andinovable into an elevated position to discharge its contents, and an adjustable connection between said loading device land said bodystructure whereby the loading device may be turned relatively to the body structure lto enable the loading device to rest upon the ground in proper supported relation relative thereto, the said loading device comprising a load skip having a relatively large wide receiving end, the bottom of which is adapted to rest upon the ground.

4. In a machine of the class described, in combination, a portable supporting frame, a body structure mounted upon said frame, means intermediate the two whereby they may be relatively adjusted so that'the body structure will remain horizontal even if the supporting frame is disposed at an angle to the horizontal, a loading device connected with said body structure, adapted to rest upon the ground and movable into an elevated position to discharge its contents, and an adjustable connection between said loading device and said body structure whereby the loading device may be turned relatively to the body structure to enable the loading device to rest upon the ground in proper supported relation relative thereto, said adjustable connecting means for the loading device comprising a bracket permanently pivoted to the body structure and a rotative connection betweensaid bracket Vand the loading device for the purpose set forth.

5. In a machine of the class described, in combination, a portable supporting frame, a body structure mounted upon said frame, means intermediate the two whereby they may be relatively adjusted so that the body structure will remain horizontal even if the supporting frame is disposed at an angle to the horizontal, a loading device connected with said body structure adapted to resty upon the ground and movable into an elevated position to discharge its contents, and an adjustable connection between said loading device and said body structure whereby the loading device may be turned relatively to the bodyv structure to enable the loading device to rest upon the ground in proper supported relation relative thereto, said adjustable connecting means for the loading device comprising a bracket permanently and pivotally attached to the body structure, adjustable connecting means between the loading device and the bracket including parts operable for effecting relatively turning of the loading device on the bracket, and other parts for holding the loading device at a certain adjustment relatively to the bracket after said turning movement.

6. In a machine ot' vthe class described, in combination, a portable supporting frame, a body structure mounted upon said frame, means intermediate. the two whereby they may be relatively adjusted so that the body structure will remain horizontal even if the Supporting frame. is disposed at an angle to the horizontal, a loadingdevice connected with said body structure, adapted to rest upon the ground and movable into an elevated position to discharge its contents, and an adjustable connection between said loading device and said body structure whereby the loading device may be turned relatively to the body structure to enable the loading device to set itseltl upon the ground in proper supported relation relative thereto, the said loading device comprising a load skip having a relatively large wide receiving end, the bottom of which is adapted to rest cured.

7. IIn a concrete paving machine comprising a portable supporting frame, a concrete mixer mounted thereon, and a boom and bucket mounted t0 travel longitudinally thereon carried by said supporting frame and adapted to swing horizontally, and adjusting means for raising or lowering one end of the supporting frame in relation to the other to maintain the said supporting frame and boom substantially horizontal when the machine is operating upon ascending or descending grades.

8. Iny a concrete paving machine comprising a portable supporting frame, a concrete mixer mounted thereon, and a boom and bucket mounted to travel longitudinally thereon carried by said supporting frame and adapted to swing horizontally, and adjusting means for raising or lowering either side of the machine relatively to the other to maintain the supporting frame and boom substantially horizontal with its sup` ported boom and bucket mechanism when the machine is working on a subgrade one side of which is higher than the other.

9. In a concrete paving machine comprising a portable supporting frame, a concrete mixer mounted thereon, and a boom and bucket mounted to travel longitudinally thereon carried by said supporting frame and adapted to swing horizontally, and adjusting means for the supporting frame for raising and lowering an end of the same relatively to its opposite end to accommodate Jfor operation of the machine on ascending and descending grades longitudinally thereof, and for adjusting a side of the supporting frame relatively to its other sideto accommodate for operation of the machine ico on road sub-grades where one side is higher than the other, substantially as set forth.

.10. In a concrete paving machine comprising a portable supporting trame, a conf crete mixer mounted thereon, and a boom and bucket attachment carried by said rsupporting` trame and adapted to swing horizontally, adjusting means for the supporting traine for raising and loweringl an end of the same relatively to its opposite ond to accommodate toi' operation o'l' the machine on ascending and descending grades longitudinally thereof, and for adjusting a side of the supporting` frame relatively to its other side to accommodate 'tor operation of the machine on road subi-grades where one side is higher 'han the other, and a loading skip and a batch bei; loading crane carried by the supporting traine of the machine op posite the boom and bucket mechanism, the portable feature of the supporting frame comprising traction vmembers with front and rear axles connecting them with the sup porting traine, the iront axle being `mounted upon the frame on the threepoint suspension principle and the adjusting means aforesaid connecting the rear end of the traine with the rear axle, all for the purpose set Jforth.

ll. In a concrete paving machine, a portable support, a superposed body thereon, a concrete mixer carried by the body, a crane attachment comprising a swinging rboom mounted on said body, and means cooperating with the support and body to raise or lower either end oit the body relative to the other, and relatively to the portable support, to maintain the body and crane sub stantially level when the machine is operating-on ascending and descending subgrades.

1Q. In a concrete paving machine, a portable support, a superposed body thereon, a concrete mixer carried by the body, a crane attachment comprising a. swinging boom mounted on said body, vand cooperating sliding means coactingfwith the support. and body to raise or lower either side of the body relative to the other, and relatively to the portable support, to maintain the body and crane substantially level vwhen the machine is operating on laterally banked snbgrades. Y

13. In a concrete paving machine, a portable support, a siiperposedbody thereon, a concreteinifier carriedby the body, a crane attachment comprising a. swinging boom mounted on said body, and means to raise oir/lower either end or either side of the body relative to the other, and relatively to the portable support, to maintain the body and Acrane substantially level when the machine is operating on ascending and descending" subgrades or on laterally 'banked subgrades, respectively.

la, `In a. concrete paving machine comprising a portable supporting frame, a concrete mixer .mounted thereon, and a boom Vand bucket attachment carried lby said supporting frame and adapted to swing horizontally, adjusting means for the supporting 'traine Yfor raising and lowering an end ot the saine relatively to its opposite end to accommodate for operation of the machine on ascending and descending grades longitudinally thereof, and for adjusting a side of the supporting traine relatively to its other side to accommodate vt'or operation ot the machine oii road sub-grade where one side is higher than the other, and a loading skip and a batch box loading ycrane carried by the supporting iranie ot the machine opposite the boom and bucket mechanism, the portable feature of the supporting frame comprising traction members with front and rear axles connecting them with the supporting frame, the front axle being mounted upon the traine on the three point suspension `principle and the adjusting means aforesaid connecting the rear end of the frame with the rear aigle, all for the purpose set forth, and meansA adjustably connecting the loading skip to the supporting frame so that the bottom ofthe skip may rest flat on the subgrade when the latter is at an angle to a horizontal plane including the base of the trame.

l5. In a concrete paving machine, a portable support, a superposed body thereon, a concrete mixer carried by the body, acrane attachment comprising a swinging b ooin mounted on said body, and means to raise or lower either end of the body relative to `the other, and relatively to the portable support, to maintain tlie body and crane substantially level when the machine is operating -on ascending and descending subgrades, a loading device connected to the'body, and ineansfor adjusting the loading device relatively to the body so the loading device may rest fiat on a subgrade located at an angle to a horizontal vplane including the body. l

16. In a concrete machine, a portable support, a superposed body thereon, a concrete mixer carried by the body a crane attach@ nient comprising a swinging boom mounted on said body, and means to raise or lower either endetl the body relative to the other, and relatively to the portable support, to

.inaiiitainthe body and crane substantially level whenthe machine is operatingon ascending and descending subgiades, a. loading device connected to the body, and means Jfor adpisting the loading device relatively to the body so that loading device inayvrest '1 ijlaton a subgrade located at lan angle to a horizontal plane including the body, and al concrete distributor carried by the body and maintained level. by movement of the body relatively to its portable support.. Y u

17. In a concrete paving machine, a portable support, a superposed body thereon, a Concrete mixer carried by the body, a crane attachment comprising a swinging boom mounted on said body, and mea-ns to raise or lower either end of the body relative to the other, and relatively to the portable support, to maintain the body and crane substantially level when the machine is operating on ascending and decending subgrades, and a concrete distributer carried by the body and maintained operatively level by adjustment of the body relatively to its support.

18. In a concrete paving machine, a portable snpport, a superposed body thereon, a concrete mixer carried by the body, a crane attachment comprising a swinging boom mounted on said body, and means to raise or lower either side of the'body relative to the other, and relatively t-o the portable support, to maintain the body and crane substantially level when the machine is operating on laterally banked subgrades, and a concrete distributer projecting from the body and maintained operatively level by an end adjustment of the body relatively to its support. i

19. In a paving machine, a traction support, a body structure thereon, boom and bucket traveling thereon paving apparatus mounted upon the body structure, and means for adjusting said boom and bucket apparatus relatively to the traction base whereby to maintain this apparatus operative in a substantially horizontal plane of movement irrespective of conditions of relative incli-y nation of the body structure and traction base.

In testimony whereof I aiiiX my signature.

ERICH H. LICHTEN BERG. 

